Quest Diagnostics is a diagnostics company operating one of the largest clinical laboratory networks in the United States. It provides testing services that support diagnosis, screening and disease monitoring.

Laboratory services

Quest offers routine and specialized tests in areas such as oncology, cardiology, infectious disease and genetics. Specimen collection centers and hospital labs feed into its national network.

Population health role

By supporting preventive screening and public health programs, Quest contributes data and testing capacity used by health systems, employers and government agencies.